IVL Swedish Environmental Research Institute

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  • 1. Ahumada, Sofía
    et al.
    Tagle, Matias
    Vasquez, Yeanice
    Donoso, Rodrigo
    Lindén, Jenny
    IVL Swedish Environmental Research Institute.
    Hallgren, Fredrik
    IVL Swedish Environmental Research Institute.
    Segura, Marta
    IVL Swedish Environmental Research Institute.
    Oyola, Pedro
    Calibration of SO2 and NO2 Electrochemical Sensors via a Training and Testing Method in an Industrial Coastal Environment2022In: Sensors, E-ISSN 1424-8220, Vol. 22, no 19, p. 7281-7281Article in journal (Refereed)
    Abstract [en]

    Low-cost sensors can provide inaccurate data as temperature and humidity affect sensoraccuracy. Therefore, calibration and data correction are essential to obtain reliable measurements.This article presents a training and testing method used to calibrate a sensor module assembledfrom SO2 and NO2 electrochemical sensors (Alphasense B4 and B43F) alongside air temperature (T)and humidity (RH) sensors.

    Field training and testing were conducted in the industrialized coastalarea of Quintero Bay, Chile. The raw responses of the electrochemical (mV) and T-RH sensors weresubjected to multiple linear regression (MLR) using three data segments, based on either voltage(SO2 sensor) or temperature (NO2). The resulting MLR equations were used to estimate the referenceconcentration. In the field test, calibration improved the performance of the sensors after addingT and RH in a linear model.

    The most robust models for NO2 were associated with data collectedat T < 10 C (R2 = 0.85), while SO2 robust models (R2 = 0.97) were associated with data segmentscontaining higher voltages. Overall, this training and testing method reduced the bias due to T andHR in the evaluated sensors and could be replicated in similar environments to correct raw data fromlow-cost electrochemical sensors. A calibration method based on training and sensor testing afterrelocation is presented. The results show that the SO2 sensor performed better when modeled fordifferent segments of voltage data, and the NO2 sensor model performed better when calibrated fordifferent temperature data segments.

  • 2.
    Danielsson, Helena
    et al.
    IVL Swedish Environmental Research Institute.
    Roux, Marta Segura
    IVL Swedish Environmental Research Institute.
    Pihl-Karlsson, Gunilla
    IVL Swedish Environmental Research Institute.
    Kartläggning av lantanoider i mossa i Sverige2018Report (Other academic)
    Abstract [sv]

    På uppdrag av Naturvårdsverket har IVL Svenska Miljöinstitutet genomfört en undersökning avseende förekomst av 14 lantanoider, ingående i gruppen sällsynta jordartsmetaller, i mossprover. Mossproverna samlades in 2015, på uppdrag av Naturvårdsverket, i bakgrundsmiljö i Sverige. Förutom att kartlägga om det fanns geografiska koncentrationsskillnader för lantanoiderna över Sverige var målet att om möjligt utröna om ursprunget för de olika lantanoiderna var antropogent. Resultaten visade på att det fanns skillnader vad gäller de olika lantanoidkoncentrationerna i mossa över landet. Utifrån erhållna resultat kunde också konstateras att medianvärdet för samtliga lanatanoider (utom europium) var statistiskt signifikant lägre för Norrland jämfört med för Götaland och Svealand, men ingen tydlig gradient kunde ses. Däremot hittades förhöjda lantanoidkoncentrationer i vissa mossprover. I denna studie användes även mossprover som insamlats 2015, på uppdrag av Kalmar läns luftvårdsförbund, i stads- och industrinära miljö i Kalmar län, för att undersöka eventuella skillnader av lantanoidkoncentrationer. Resultaten visade att koncentrationerna av samtliga lantanoider i mossproverna var signifikant högre i stads- och industrinära miljö jämfört med i bakgrundsmiljön. Däremot fanns ingen statistiskt signifikant skillnad i koncentrationer av lantanoider i mossa mellan prover som insamlats i stads- och industrinära miljö. Data från litteraturen möjliggjorde även en jämförelse av lantanoidkoncentrationerna i mossprover över tid från bakgrundsmiljön i södra Sverige. I jämförelsen användes resultat från mossprover tagna 1975, 2000 samt 2015. Allra högst lantanoidkoncentrationer fanns i proverna från 1975. Mellan 1975 och 2000 minskade lantanoidkoncentrationerna i mossproverna med mer än hälften (i medeltal 62 %). Även mellan 2000 och 2015 minskade koncentrationerna i mossan för flertalet lantanoider med nästan hälften (i medeltal 44 %).

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    FULLTEXT01
  • 3.
    Klemetz, Viktor
    et al.
    IVL Swedish Environmental Research Institute.
    Danielsson, Helena
    IVL Swedish Environmental Research Institute.
    Hansson, Katarina
    IVL Swedish Environmental Research Institute.
    Nerentorp, Michelle
    IVL Swedish Environmental Research Institute.
    Pihl-Karlsson, Gunilla
    IVL Swedish Environmental Research Institute.
    Potter, Annika
    IVL Swedish Environmental Research Institute.
    Segura Roux, Marta
    IVL Swedish Environmental Research Institute.
    Söderlund, Karin
    IVL Swedish Environmental Research Institute.
    Areskoug, Hans
    Hamzavi, Zahra
    Hansson, Christen
    Krejci, Radovan
    Mellqvist, Johan
    Lindström, Bodil
    Nanos, Therese
    Alpfjord Wylde, Helene
    Andersson, Camilla
    Andersson, Sandra
    Carlund, Thomas
    Leung, Wing
    Nationell luftövervakning: Sakrapport med data från övervakning inom Programområde Luft t. o. m. 20212023Report (Other academic)
    Abstract [en]

    The Swedish Environmental Protection Agency is responsible for the national air quality and precipitation monitoring in rural background areas.

    This report presents the results from the activities within the National monitoring programme for air pollutants including measurements (performed by IVL Swedish Environmental Research Institute (IVL), Stockholm University (SU), Swedish University of Agricultural Sciences (SLU), Chalmers University of Technology and Swedish Meteorological and Hydrological Institute (SMHI) respectively) until 2021 and modelling (performed by SMHI) until 2020

    .For most of the air pollutants monitored the situation has improved significantly since the measurements started between 20 and 40 years back, regarding air concentrations as well as deposition in the rural background.

    The pollution load is in general decreasing the further north one goes.For most of the components for which there are environmental quality standards (EQS) and environmental objectives, the concentrations are well below the limit and target values.

    The concentrations of ground-level ozone exceed the air quality standard for health at several locations in southern Sweden. For particles (PM2,5) and benzene (in urban background air) there is a low risk for concentration levels above the specifications of the environmental objectives.

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    Nationell luftövervakning 2021
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